Filter

TrajFrame.filter(expr[, drop])	Filter trajectories using conditional on a single column variable specified with a string or Polars expression.
TrajFrame.filter_isin(var, values[, drop])	Filter trajectories with at least one variable observation in a given sequence of values.
TrajFrame.filter_polygon(xy_vars, x_poly, y_poly)	Filter trajectories which intersect a specified polygon.